“主流的”用英语怎么说？

我们为尚未进入主流的少数群体说话.We speak for the minorities who have not yet entered the mainstream.所有这些书的作者都坚信主流的资本主义思想.All of these writers are firmly centered in mainstream capitalist thinking.我想买一些非主流的音乐给我侄女.I'd like to get so...